枣-紫花苜蓿/杂草间作对滨海滩地土壤化学性状的影响OA

Establishing jujube orchards is a promising way for developing flat land in the Yellow River delta,but now it is challenged by soil degradation.To solve this problem,a positioning experiment was carried out at a coastal flat in the Weifang City.In 2019,two modes of jujube orchard were experimented,with planted alfalfa and wild weeds,respectively,as understory ground cover.Thus,their impacts on soil chemical properties in the orchard were observed and compared.The soil pH,salinity and contents of total nitrogen,total phosphorus,total potassium and organic matter in the soil layers of 0-20 and 20-40 cm depth were measured and compared from 2019 to 2022.The results showed that,soil salinity and pH under the weed mulch increased by 28.33％and 3.45％,respectively,and the contents of organic matter and total potassium increased by 61.84％and 90.10％,while the contents of soil total phosphorous and total nitrogen decreased by 35.42％and 15.11％,respectively.Compared with the weed mulch mode,the mode of alfalfa mulch made soil salinity decreased by 15.52％,pH increased by 0.87％,organic matter content increased by 8.94％,total phosphorous content increased by 12.69％,total nitrogen content increased by 15.14％,but total potassium content decreased by 0.29％.The mode of alfalfa mulch is superior to that of weed mulch in withdrawing the increasing of soil salinity and loss of soil phosphorous and nitrogen,but slightly inferior in the aspect of soil pH and potassium improvement.Even so,the alfalfa mulch is not sufficient to completely prevent the tendency of soil salinization and nitrogen and phosphorous loss in the coastal orchard.